#define _CRT_SECURE_NO_WARNINGS
//#include<stdio.h>
//int main()
//{
//	printf("%s", "aaa");
//	printf("%c", '\b');
//	getchar();
//	return 0;
//}
#include <stdio.h>

int main()
{
    int a, b, c;
    while (scanf("%d%d%d", &a, &b, &c) != EOF)
    {
        if (a + b > c && a + c > b && b + c > a)
        {
            if (a == b && b == c)
            {
                printf("Equilateral triangle!\n");
            }
            else if (a == b || b == c || c == a)
            {
                printf("Isosceles triangle!\n");
            }
            else
            {
                printf("Ordinary triangle!\n");
            }
        }
        else {
            {printf("Not a triangle!\n"); }
        }
    }
    return 0;
}